Nearly three decades after Princess Diana's death, her brother Earl Spencer has published a book that has drawn a rare public rebuke from King Charles III, reopening the enduring question of who holds the authority to shape a life's legacy. The dispute is not merely personal — it is a collision between two competing claims to truth, one rooted in fraternal witness and the other in institutional continuity. As the monarchy has long understood, the stories that surround it are never fully settled, and the past has a way of returning on its own terms.